Should You Use Mouthwash?

A lot of people have a nightly habit of rinsing with mouthwash. Some do it because it tastes good, others do it because they believe it helps with bad breath, while other do it because their dentist told them to. There are mixed opinions about the effectiveness of mouthwash, with some actually believing it can do you harm.

The Studies:

Mouthwash does, in fact, appear to be effective. One meta analysis found that mouthwash that contained the ingredient chlorhexidine (the current gold standard) reduced plaque by an average of 33% and gingivitis by an average of 26%. It has also been found to reduce bad breath. The downside of chlorhexidine mouthwash is that it has been found to stain teeth a light brown color at times. One study found that Listerine® and Meridol® (which don’t contain chlorhexidine) lowered plaque (but not as much as chlorhexidine) and had no effect on gingivitis. Another meta analysis, though, found that Listerine® was as effective as chlorhexidine in protecting against gingivitis.

Many mouthwashes contain alcohol, with some being composed of as much as 26% ethanol. Some studies have associated mouthwash containing alcohol with oral cancer. However, a meta analysis found no association between mouthwash use and cancer. Given that 5 recent studies have shown a negligible benefit to alcohol in terms of reducing plaque and gingivitis, you might want to go with a non-alcohol mouthwash to be safe.

Conclusion:

Using mouthwash has been shown to be beneficial in reducing plaque, gingivitis and bad breath. So use a chlorhexidine mouthwash if want to reduce plaque and gingivitis as much as possible (and can stand the staining). If not, Listerine® appears to be a decent alternative. Go with a non-alcohol mouthwash regardless though.